I filled a tank with 54 gallons of water. 39 gallons leaked from the tank. How many gallons of water is left in the tank?
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Joanna watered 21 of the 97 plants. How many plants still need to be watered?
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My brother lost 2 pebbles out of the 72 pebbles he collected from the river. How many pebbles are left with my brother?
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73 birds are sitting on a tree. 40 of them flew away. How many birds will be left on the tree?
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Jean invited 37 friends to her birthday party. Only 10 friends came to the party. How many friends didn't came to Jean's party.
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